Buggy code:
public final class LegacyActionPersistence extends RegistryPersistence { private static final int INDEX_ACTION_SETS = 0 ; private static final int INDEX_EDITOR_CONTRIBUTIONS = 1 ; private static final int INDEX_OBJECT_CONTRIBUTIONS = 2 ; private static final int INDEX_VIEW_CONTRIBUTIONS = 3 ; private static final int INDEX_VIEWER_CONTRIBUTIONS = 4 ; private static final SLocation createLocation ( final int barType , final String path , final LegacyLocationInfo locationInfo , final char mnemonic , final String imageStyle ) { } private static final Expression readVisibility ( final IConfigurationElement parentElement , final String parentId , final List warningsToLog ) { } private final BindingManager bindingManager ; private final CommandImageManager commandImageManager ; private final CommandManager commandManager ; private final Collection menuContributions = new ArrayList ( ) ; private final IMenuService menuService ; public LegacyActionPersistence ( final CommandManager commandManager , final BindingManager bindingManager , final CommandImageManager commandImageManager , final IMenuService menuService ) { } private final void clearBindings ( ) { } private final void clearImages ( ) { } private final void clearMenus ( ) { } private final void convertActionToBinding ( final IConfigurationElement element , final ParameterizedCommand command ) { } private final ParameterizedCommand convertActionToCommand ( final IConfigurationElement element , final String primaryId , final String secondaryId , final List warningsToLog ) { } private final String convertActionToImages ( final IConfigurationElement element , final ParameterizedCommand command ) { } private final void convertActionToItem ( final IConfigurationElement element , final List warningsToLog , final ParameterizedCommand command , final String imageStyle , final LegacyLocationInfo locationInfo , final Expression visibleWhenExpression ) { } protected final boolean isChangeImportant ( final IRegistryChangeEvent event ) { } public final void dispose ( ) { } public final void read ( ) { } private final SReference [ ] readActions ( final String primaryId , final IConfigurationElement [ ] elements , final List warningsToLog , final LegacyLocationInfo locationInfo , final Expression visibleWhenExpression ) { } private final SReference [ ] readActionsAndMenus ( final IConfigurationElement element , final String id , final List warningsToLog , final LegacyLocationInfo locationInfo , final Expression visibleWhenExpression ) { } private final void readActionSets ( final IConfigurationElement [ ] configurationElements , final int configurationElementCount ) { final List warningsToLog = new ArrayList ( 1 ) ; for ( int i = 0 ; i < configurationElementCount ; i ++ ) { final IConfigurationElement element = configurationElements [ i ] ; final String id = readRequired ( element , ATTRIBUTE_ID , warningsToLog , "Action<seq2seq4repair_space>sets<seq2seq4repair_space>need<seq2seq4repair_space>an<seq2seq4repair_space>id" ) ; if ( id == null ) continue ; final String label = readRequired ( element , ATTRIBUTE_LABEL , warningsToLog , "Actions<seq2seq4repair_space>set<seq2seq4repair_space>need<seq2seq4repair_space>a<seq2seq4repair_space>label" , id ) ; if ( label == null ) continue ; final String description = readOptional ( element , ATTRIBUTE_DESCRIPTION ) ; final boolean visible = readBoolean ( element , ATTRIBUTE_VISIBLE , false ) ; final SReference [ ] references = readActionsAndMenus ( element , id , warningsToLog , null , null ) ; <START_BUG> if ( references == null ) { <END_BUG> continue ; } final SActionSet actionSet = menuService . getActionSet ( id ) ; actionSet . define ( label , description , visible , references ) ; } logWarnings ( warningsToLog , "Warnings<seq2seq4repair_space>while<seq2seq4repair_space>parsing<seq2seq4repair_space>the<seq2seq4repair_space>action<seq2seq4repair_space>sets<seq2seq4repair_space>from<seq2seq4repair_space>the<seq2seq4repair_space>'org.eclipse.ui.actionSets'<seq2seq4repair_space>extension<seq2seq4repair_space>point" ) ; } private final void readEditorContributions ( final IConfigurationElement [ ] configurationElements , final int configurationElementCount ) { } private final SReference [ ] readGroups ( final IConfigurationElement [ ] elements , final List warningsToLog , final String path , final LegacyLocationInfo locationInfo , final Expression visibleWhenExpression , final boolean separatorsVisible ) { } private final SReference [ ] readMenusAndGroups ( final IConfigurationElement [ ] menuElements , final String contributionId , final List warningsToLog , final LegacyLocationInfo locationInfo , final Expression visibleWhenExpression ) { } private final void readObjectContributions ( final IConfigurationElement [ ] configurationElements , final int configurationElementCount ) { } private final void readViewContributions ( final IConfigurationElement [ ] configurationElements , final int configurationElementCount ) { } private final void readViewerContributions ( final IConfigurationElement [ ] configurationElements , final int configurationElementCount ) { } }

Fix:
if ( ( references == null ) || ( ( references . length ) == 0 ) ) {